US6521472B2 - Method of forming a capacitor container electrode and method of patterning a metal layer by selectively silicizing the electrode or metal layer and removing the silicized portion - Google Patents
Method of forming a capacitor container electrode and method of patterning a metal layer by selectively silicizing the electrode or metal layer and removing the silicized portion Download PDFInfo
- Publication number
- US6521472B2 US6521472B2 US09/778,840 US77884001A US6521472B2 US 6521472 B2 US6521472 B2 US 6521472B2 US 77884001 A US77884001 A US 77884001A US 6521472 B2 US6521472 B2 US 6521472B2
- Authority
- US
- United States
- Prior art keywords
- rubbing
- orientation film
- liquid crystal
- metal layer
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime, expires
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133784—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by rubbing
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
- G02F1/133723—Polyimide, polyamide-imide
Definitions
- the present invention relates to a liquid crystal display (LCD), and more particularly to a method of fabricating a liquid crystal display device for eliminating a rubbing error.
- LCD liquid crystal display
- the LCD consumes a low power and weighs light. Due to such characteristics, it is well suited for use in word processors, personal computers, and navigational systems.
- the LCD conventionally includes an upper substrate having a transparent electrode, a lower substrate having a switching device and a pixel electrode, and a liquid crystal interposed between the upper and lower substrates.
- Various types of liquid crystals have been used in the LCD, such as a twisted nematic (TN) liquid crystal, a super twisted nematic (STN) liquid crystal, and a cholesteric liquid crystal.
- FIG. 1 illustrates a cross-sectional view of a conventional LCD.
- the conventional LCD 11 includes an upper substrate 5 having a color filter 7 , a black matrix 6 , and a common electrode 18 .
- the LCD also has a lower substrate 21 spaced apart from the upper substrate 5 .
- the lower substrate 21 has a pixel electrode 8 and a switching device (not shown) that are formed in a pixel area of the lower substrate 21 .
- Orientation films 23 are formed on the upper and lower substrates 5 and 21 .
- a liquid crystal 33 is injected between the upper and lower substrates 5 and 21 .
- upper and lower polarizers 25 and 27 are respectively formed on the outer surfaces of the upper and lower substrates 5 and 21 .
- the LCD 11 controls incident light by absorbing or transmitting from backlight 31 .
- the control is based on an alignment of the molecules of the liquid crystal 33 , which has an optical anisotropy. By properly controlling the transmission of the light from the back light 31 , desired images can be displayed. Since the alignment of the molecules of the liquid crystal 33 affects an optical property of the LCD 11 , it is very important to accurately control the alignment of those molecules.
- the orientation films 23 are critical elements in controlling the alignment of the liquid crystal molecules.
- orientation films 23 are rubbed to have a plurality of minute grooves on their surface.
- a rubbing fabric rolled onto a roller the surface of the orientation film is rubbed in a uniform direction.
- the orientation film has a plurality of minute grooves on its surface and an alignment angle due to the grooves such that the liquid crystal molecules align according to the alignment angle.
- a smooth fabric is used for the rubbing fabric.
- a rubbing apparatus includes a roller and has a relatively simple configuration. In a rubbing process, it is important to apply an appropriate rubbing force in a uniform direction. Unless the rubbing is uniform, localized variations of optical properties occur.
- the orientation films 23 on the upped and lower substrates 5 and 21 provide conditions such that a uniform liquid crystal molecule alignment is achieved.
- a relative orientation of the liquid crystal molecules is often indicated by an angle formed between the longitudinal axes of the liquid crystal molecules and the substrates.
- the alignment stability of a liquid crystal is greatly affected by an anchoring force that is produced between the substrate and the liquid crystal molecules.
- the anchoring force is dependent upon the surface area of the liquid crystal molecules and the orientation film. In other words, the anchoring force serves to stabilize an alignment state of the liquid crystal molecules.
- Orientation films 23 can be inorganic, organic, or both inorganic and organic.
- an inorganic orientation film may be formed by a silicon oxide (SiO 2 ) deposition method.
- SiO 2 deposition method an inorganic material (such as a metal) or an oxide is deposited on the substrate such that a slope is formed between the inorganic material and the substrate.
- Silicon oxide (SiO 2 ) is conventionally used for the inorganic material.
- the molecular alignment of a liquid crystal varies with the deposited material, the liquid crystal itself, and deposition conditions including a deposition angle, speed, a vacuum rate, a substrate temperature, and a film thickness.
- the orientation film formed on the substrate is repeatedly rubbed in one direction using a diamond paste. Due to the minute grooves formed on the orientation film along the rubbing direction, a desired alignment of the liquid crystal molecules is achieved. In practice, a tilt angle of the rubbing process is almost 0 degree, resulting in the liquid crystal molecules to be homogeneously aligned.
- Physical properties of the liquid crystal 33 vary with the molecular alignment. The alignment nay vary by external forces, such as an electric field. A technology for controlling the molecular alignment of the liquid crystal molecules 33 is of interest in fabricating an LCD.
- FIG. 2 The process of fabricating the above-mentioned orientation film is explained with reference to FIG. 2 .
- an orientation film 53 of polyimide or the like is formed on a substrate 51 .
- the surface of the orientation film 53 is rubbed using a rubbing fabric 57 wound around a roller 55 .
- the orientation film 53 has a plurality of minute grooves 53 a . Since the rubbing fabric 57 has a plurality of woof and warp threads that are crossed with each other, a pattern of the minute grooves 53 a are formed on the orientation film 53 during the above-mentioned rubbing process.
- defects may occur on the surface of the rubbing fabric 57
- the defects of the rubbing fabric 57 result from either an extraneous matter on the orientation film 53 or patterns formed on the substrate 51 .
- These defects of the rubbing fabric 57 cause rubbing defects such as an irregular surface of the orientation film 53 (a scratch error) or a wave of the polyimide.
- FIG. 3 is a photograph showing a surface of an orientation film where the above-mentioned scratch error occurs.
- the surface of the orientation film is very irregular.
- the above-mentioned irregular surface of the orientation film negatively affects a first alignment state of the liquid crystal.
- uniformity in aligning the liquid crystal molecules decreases. Therefore, a display quality of the liquid crystal display is deteriorated.
- the present invention is directed to a method of fabricating a liquid crystal display for eliminating an rubbing error that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
- An object of the present invention is to provide a method of repairing a rubbing defect of a LCD device having orientation films.
- a method of rubbing for a liquid crystal display includes the steps of rubbing an orientation film on a substrate using a first rubbing fabric, detecting defects of the orientation film, and repeating the step of rubbing the orientation using a second rubbing fabric when the defects are detected.
- FIG. 1 is a cross-sectional view illustrating an LCD device according to the related art
- FIG. 2 is a perspective view illustrating a typical rubbing process for an orientation film of the LCD device according to the related art
- FIG. 3 is a photograph illustrating a surface of the orientation film where a scratch error occurs
- FIGS. 4A to 4 C illustrate a rubbing process according to a preferred embodiment of the present invention.
- FIG. 5 is a photograph illustrating a surface of the orientation film having a stable alignment of liquid crystal molecules according to the present invention.
- FIGS. 4A to 4 C illustrate a rubbing process according to a preferred embodiment of the present invention.
- a roller 115 having a rubbing fabric 117 rotates to cover an orientation film 113 that is formed on a substrate 111 .
- the substrate 111 has a color filter layer (shown as the reference 7 in FIG. 1) or a TFT array (not shown) thereon.
- a polyimide-based material is used for the above-mentioned orientation film 113 .
- a diamine compound and anhydride are reacted in a solvent, a polyamic acid is produced.
- a typical wax for spraying is a solution of the polyamic acid.
- polyimide is produced.
- the roller 115 rotates to roll on the orientation film 113 .
- the surface of the orientation film 113 is uniformly rubbed by the rubbing fabric 117 wound around the roller 115 . Since the rubbing fabric 117 has a plurality of woof and warp threads that are crossed with each other, a pattern of the minute grooves 113 a are formed on the orientation film 113 during the above-mentioned rubbing process.
- defects may occur on the surface of the rubbing fabric 117 .
- the defects of the rubbing fabric 117 result from an extraneous matter on the orientation film 113 , or patterns formed on the substrate 111 (shown in FIG. 1 ).
- the defects of the rubbing fabric 117 cause rubbing defects such as an irregular surface on the orientation film 113 (a scratch error) or a wave of the orientation film 113 , which are shown in FIG. 4 B.
- the rubbing fabric 117 as replaced with a new rubbing fabric 118 .
- the orientation film 113 having a scratch error is rubbed again using the roller 115 wound by a new rubbing fabric 116 .
- FIG. 5 shows a photograph of the surface of the orientation film 113 after the above-mentioned second rubbing step is completed. As shown in the drawing, a plurality of minute grooves is uniformly formed without a scratch error or wave of the orientation film 113 .
- a hardening rate, or an imidation rate of the orientation film 113 becomes in the range of about 80 to 85%.
- the double rubbing method does not affect a uniformly rubbed surface of the orientation film. Accordingly, by the double rubbing method according to the preferred embodiment, the rubbing defects are easily repaired.
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
Description
Claims (6)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2000-5836 | 2000-02-08 | ||
KR00-5836 | 2000-02-08 | ||
KR1020000005836A KR20010077785A (en) | 2000-02-08 | 2000-02-08 | method for rubbing on the substrate for liquid crystal display device |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010017682A1 US20010017682A1 (en) | 2001-08-30 |
US6521472B2 true US6521472B2 (en) | 2003-02-18 |
Family
ID=19644752
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/778,840 Expired - Lifetime US6521472B2 (en) | 2000-02-08 | 2001-02-08 | Method of forming a capacitor container electrode and method of patterning a metal layer by selectively silicizing the electrode or metal layer and removing the silicized portion |
Country Status (2)
Country | Link |
---|---|
US (1) | US6521472B2 (en) |
KR (1) | KR20010077785A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8525941B2 (en) * | 2009-06-19 | 2013-09-03 | Taiguen Technology (Shen—Zhen) Co., Ltd. | Electromagnetic induction type LC panel and method for manufacturing the same and LCD device |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE60040011D1 (en) * | 1999-10-19 | 2008-10-02 | Rolic Ag | TOPOLOGICALLY STRUCTURED POLYMER COATING |
CN101963708B (en) | 2009-07-24 | 2012-06-27 | 北京京东方光电科技有限公司 | Detection device for preventing production equipment from scratching substrate and detection method |
US20150234227A1 (en) * | 2014-02-17 | 2015-08-20 | Samsung Display Co., Ltd. | Liquid crystal display and method of manufacturing the same |
CN104808394B (en) * | 2015-05-07 | 2017-10-17 | 合肥鑫晟光电科技有限公司 | Friction orientation equipment |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6366534A (en) * | 1986-09-09 | 1988-03-25 | Asahi Glass Co Ltd | Production of liquid crystal display element |
JPH03156424A (en) * | 1989-11-15 | 1991-07-04 | Alps Electric Co Ltd | Method for processing rubbing orientation of liquid crystal display element |
US5172255A (en) * | 1989-10-06 | 1992-12-15 | Nokia Unterhaltungselektronik (Deutschland) Gmbh | Process for increasing pretilt angles in nematic liquid crystal cells |
US5315421A (en) * | 1992-04-28 | 1994-05-24 | Matsushita Electric Industrial Co., Ltd. | Rubbing apparatus including double refraction phase difference measuring means and manufacturing method for liquid crystal display device |
US5353141A (en) * | 1991-10-08 | 1994-10-04 | Canon Kabushiki Kaisha | Method for aligning treatment of liquid crystal device including varying with time the feeding speed of the rubbing roller |
JPH10111237A (en) * | 1996-10-07 | 1998-04-28 | Hitachi Ltd | Manufacture of liquid crystal display device, method and apparatus for optical inspection |
-
2000
- 2000-02-08 KR KR1020000005836A patent/KR20010077785A/en not_active IP Right Cessation
-
2001
- 2001-02-08 US US09/778,840 patent/US6521472B2/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6366534A (en) * | 1986-09-09 | 1988-03-25 | Asahi Glass Co Ltd | Production of liquid crystal display element |
US5172255A (en) * | 1989-10-06 | 1992-12-15 | Nokia Unterhaltungselektronik (Deutschland) Gmbh | Process for increasing pretilt angles in nematic liquid crystal cells |
JPH03156424A (en) * | 1989-11-15 | 1991-07-04 | Alps Electric Co Ltd | Method for processing rubbing orientation of liquid crystal display element |
US5353141A (en) * | 1991-10-08 | 1994-10-04 | Canon Kabushiki Kaisha | Method for aligning treatment of liquid crystal device including varying with time the feeding speed of the rubbing roller |
US5315421A (en) * | 1992-04-28 | 1994-05-24 | Matsushita Electric Industrial Co., Ltd. | Rubbing apparatus including double refraction phase difference measuring means and manufacturing method for liquid crystal display device |
JPH10111237A (en) * | 1996-10-07 | 1998-04-28 | Hitachi Ltd | Manufacture of liquid crystal display device, method and apparatus for optical inspection |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8525941B2 (en) * | 2009-06-19 | 2013-09-03 | Taiguen Technology (Shen—Zhen) Co., Ltd. | Electromagnetic induction type LC panel and method for manufacturing the same and LCD device |
Also Published As
Publication number | Publication date |
---|---|
US20010017682A1 (en) | 2001-08-30 |
KR20010077785A (en) | 2001-08-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8692965B2 (en) | Method and apparatus of forming alignment layer for liquid crystal display device | |
US6025900A (en) | Method of controlling pretilt of liquid crystal cell | |
US20090002612A1 (en) | Liquid Crystal Display Panel and Fabrication Method For Liquid Crystal Display Panel | |
US20060012740A1 (en) | Apparatus and method for rubbing lcd substrate | |
JP2004226974A (en) | Non-rubbing liquid crystal orientation method | |
US6027772A (en) | Optical alignment composition, alignment layer formed using the same and LCD having the alignment layer | |
GB2281405A (en) | Liquid crystal display | |
US7414687B2 (en) | Method of forming alignment layer in LCD | |
KR20020064295A (en) | Liquid crystal display element, optically anisotropic film, and methods for manufacturing them | |
KR100969148B1 (en) | A method of fabricating retardation film using of polarized uv | |
US6642982B2 (en) | Liquid crystal display device with orientation film having projecting edge portions and manufacturing method of the same | |
US7018687B2 (en) | Liquid crystal display device | |
KR101040457B1 (en) | A coated compensate film for lcd and the fabrication method | |
US6521472B2 (en) | Method of forming a capacitor container electrode and method of patterning a metal layer by selectively silicizing the electrode or metal layer and removing the silicized portion | |
US5946064A (en) | Alignment layer, method for forming alignment layer and LCD having the same | |
US8184248B2 (en) | Apparatus for fabricating liquid crystal display panels | |
KR20050070514A (en) | A coated compensate film for lcd and the fabrication method | |
US6876425B2 (en) | LCD device implementing FLCP orientation film | |
US20020054960A1 (en) | Method for making an optical film | |
JPH11352487A (en) | Liquid crystal element and its drive method | |
EP1168052B1 (en) | Method of manufacturing liquid crystal display | |
KR0178418B1 (en) | Manufacturing method of liquid crystal panel | |
US5555240A (en) | Process for fabricating a liquid crystal display with switching elements formed in a substrate | |
KR101320497B1 (en) | Apparatus for rubbing and method thereof | |
KR100294685B1 (en) | Orientation Division Liquid Crystal Display Device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: LG. PHILIPS LCD CO., LTD., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KIM, YOUNG-HO;REEL/FRAME:011809/0432 Effective date: 20010430 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
AS | Assignment |
Owner name: LG DISPLAY CO., LTD., KOREA, REPUBLIC OF Free format text: CHANGE OF NAME;ASSIGNOR:LG.PHILIPS LCD CO., LTD.;REEL/FRAME:021147/0009 Effective date: 20080319 Owner name: LG DISPLAY CO., LTD.,KOREA, REPUBLIC OF Free format text: CHANGE OF NAME;ASSIGNOR:LG.PHILIPS LCD CO., LTD.;REEL/FRAME:021147/0009 Effective date: 20080319 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
FPAY | Fee payment |
Year of fee payment: 12 |